TY  - JOUR
A1  - Amthor, Matthias
A1  - Weißenseel, Sebastian
A1  - Fischer, Julian
A1  - Kamp, Martin
A1  - Schneider, Christian
A1  - Höfling, Sven
T1  - Electro-optical switching between polariton and cavity lasing in an InGaAs quantum well microcavity
N2  - We report on the condensation of microcavity exciton polaritons under optical excitation in a microcavity with four embedded InGaAs quantum wells. The polariton laser is characterized by a distinct nonlinearity in the input-output-characteristics, which is accompanied by a drop of the emission linewidth indicating temporal coherence and a characteristic persisting emission blueshift with increased particle density. The temporal coherence of the device at threshold is underlined by a characteristic drop of the second order coherence function to a value close to 1. Furthermore an external electric field is used to switch between polariton regime, polariton condensate and photon lasing.
KW  - Quantum-well, -wire and -dot devices
KW  - Scattering
KW  - stimulated
KW  - Resonators
KW  - Microcavity devices
Y1  - 2014
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-111130
ER  - 
TY  - JOUR
A1  - Brixner, Tobias
A1  - Pawłowska, Monika
A1  - Goetz, Sebastian
A1  - Dreher, Christian
A1  - Wurdack, Matthias
A1  - Krauss, Enno
A1  - Razinskas, Gary
A1  - Geisler, Peter
A1  - Hecht, Bert
T1  - Shaping and spatiotemporal characterization of sub-10-fs pulses focused by a high-NA objective
N2  - We describe a setup consisting of a 4 f pulse shaper and a microscope with a high-NA objective lens and discuss the spects most relevant for an undistorted spatiotemporal profile of the focused beam. We demonstrate shaper-assisted pulse compression in focus to a sub-10-fs duration using phase-resolved interferometric spectral modulation (PRISM). We introduce a nanostructure-based method for sub-diffraction spatiotemporal characterization of strongly focused pulses. The distortions caused by optical aberrations and space–time coupling from the shaper can be reduced by careful setup design and alignment to about 10 nm in space and 1 fs in time.
KW  - Interference microscopy
KW  - Scanning microscopy
KW  - Subwavelength structures
KW  - nanostructures
KW  - Pulse shaping
KW  - Ultrafast measurements
Y1  - 2014
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-111120
ER  -